For this design the output of RNG is decoded by a 4-bit
7-Segments Decoder and the output is displayed in numerical visual form via
a twin 7-segments LED display. Many other uses of the RNG output are
possible.

Networking Applications - some routing and flooding algorithms are
based on randomness

Games - many games (such as playing-card games) require randomness

Expansions:

A 4-bit RNG generates a random output inclusively between 0 and 15.
Likewise, a 5-bit RNG generates a random output between 0 and 31. By simply
replacing the counter and the register within the RNG circuit, we can
control the range of the random outputs.

But what if we want to have a random range that is not a power of 2? In
this case additional logics are required.

For example, if we want to have a random range of 0 to 200, we will need
to have an 8-bit counter and register (at least 8-bit, that is). However,
since an 8-bit number is ranged from 0 to 255, we will need to have additional
logics to reset the counter (not the register!) when the count reaches 201
(that is, the counter will need to have a clear input). In this case, the
counter will count from 0 to 200, and back to 0 again. 201 in decimal is
equivalent to 11001001 in binary.

Basic Flow:

Using logic gates:

Another design, if you have an 8-bit comparator handy (don't
forget to set the parameter!):